A test of constancy of dark matter halo surface density and radial acceleration relation in relaxed galaxy groups

Abstract

The dark matter halo surface density, given by the product of the dark matter core radius ($r_c$) and core density (${\rho }_c$) has been shown to be a constant for a wide range of isolated galaxy systems. Here, we carry out a test of this {\em ansatz} using a sample of 17 relaxed galaxy groups observed using Chandra and XMM-Newton, as an extension of our previous analysis with galaxy clusters. We find that ${\rho }_c\propto r_c^{-1.35_{-0.17}^{+0.16}}$, with an intrinsic scatter of about 27.3%, which is about 1.5 times larger than that seen for galaxy clusters. Our results thereby indicate that the surface density is discrepant with respect to scale invariance by about 2$\sigma$, and its value is about four times greater than that for galaxies. Therefore, the elevated values of the halo surface density for groups and clusters indicate that the surface density cannot be a universal constant for all dark matter dominated systems. Furthermore, we also implement a test of the radial acceleration relation for this group sample. We find that the residual scatter in the radial acceleration relation is about 0.32 dex and a factor of three larger than that obtained using galaxy clusters. The acceleration scale which we obtain is in-between that seen for galaxies and clusters.

11 pages, 8 figures. Accepted in Phys. Dark universe

References in corpus (14)

• The Radial Acceleration Relation in Rotationally Supported Galaxies
• Probing the Dark Matter and Gas Fraction in Relaxed Galaxy Groups with X-ray observations from Chandra and XMM
• X-ray Group and cluster mass profiles in MOND: Unexplained mass on the group scale
• The core-cusp problem: a matter of perspective
• Fuzzy Dark Matter and Dark Matter Halo Cores
• The Absence of Adiabatic Contraction of the Radial Dark Matter Profile in the Galaxy Cluster A2589
• XMM-Newton study of 0.012<z<0.024 groups. I: Overview of the IGM thermodynamics
• On the surface density of dark matter haloes
• Constraints on variation of fine structure constant from joint SPT-SZ and XMM-Newton observations
• Yet another test of Radial Acceleration Relation for galaxy clusters
• On the Presence of a Universal Acceleration Scale in Elliptical Galaxies
• A tight scaling relation of dark matter in galaxy clusters
• Reply to: Overconfidence in Bayesian analyses of galaxy rotation curves
• A test of Radial Acceleration Relation for the {\it Giles et al Chandra} cluster sample

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• A test of galaxy cluster fundamental plane for the X-COP sample
• The analytic radial acceleration relation for galaxy clusters
• A test of invariance of halo surface density for FIRE-2 simulations with cold dark matter and self-interacting dark matter
• A test of MOND and Emergent Gravity with SMACS J0723.3-7327 using eROSITA observations